patch 8.2.2291: Vim9: cannot use "null" for v:null

Problem:    Vim9: cannot use "null" for v:null.
Solution:   Support "null" like "true" and "false". (closes #7495)
diff --git a/src/version.c b/src/version.c
index 5585365..4a42d49 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2291,
+/**/
     2290,
 /**/
     2289,